| Component | Open WebUI |
| Severity | medium (CVSS 6.5) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| Published (NVD) | 2026-09-09 |
| Last modified | 2026-09-14 |
| Affected versions | open_webui >= 0.10.0, < 0.11.1 |
| Fixed in | 0.11.1 |
| Weakness | CWE-835 |
| CISA KEV | not listed |
NVD description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, DELETE /api/v1/chats/{id}/messages/{message_id} used the chat-history deletion helper in backend/open_webui/models/chats.py to follow childrenIds without recording visited message identifiers. An authenticated user could store a cyclic chat tree and delete a message, causing a synchronous infinite loop on the server request loop that blocked every user's requests until the process was killed. This issue is fixed in version 0.11.1.
What to do
- Upgrade Open WebUI to
0.11.1or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-88000
- https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2
- https://github.com/open-webui/open-webui/commit/b933292d63d12be3fd1416fe55519ddc7aa336bc
- https://github.com/open-webui/open-webui/pull/28035
- https://github.com/open-webui/open-webui/releases/tag/v0.11.1
Read more
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